If whirlpool/kenmore remove front panel after lifting top belt idler may be "improved glide type" instead of roller type replace with roller type if roller type ck rear support rollers for wear and rough spindle do not oil wipe spindle clean with wd40 and reinstall rollers being they spin freely

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Not all will apply to every dryer. Check our video page for more style dryers.

Rollers

Many dryers use rollers or wheels to support the clothes drum.
When these rollers are worn, they can be noisy. You should replace the
whole set of rollers at the same time. You will need to disassemble the dryer to check these. Some dryers use rollers in both the front and rear.

Belt

The Belt should be replaced if you hear any noise coming from it
or if there is any cracking, glazing, or grooves worn out.replace the belt along with the idler pulley.

Idler pulley

Dryers have a tension or ideler pulley
that keeps tension on the main drive belt. When it's worn, it can be
noisy. When that happens, don't lubricate it. Just replace it.

Glides

Many dryers use nylon or plastic glides at the front of the
clothes drum for support. When these are worn, they can be noisy. When
that happens, replace the glides and bearing houses if necessary. Put hand inside drum near front and push up there should be no play.

Rear drum bearing

Some dryers support the clothes drum in the rear with a center
spindle instead of rollers. The spindle may be a ball-and-socket type
support or a shaft through a sleeve. When the components are worn, they
may squeak, squeal, or rub. You can't repair them. Just replace the rear bearing when they're worn. Put hand inside drum near rear and push up there should be no play.

Blower wheel

Your dryer's blower whells pulls air over the heat source, through the clothes drum, and past the
thermosta ts, then pushes it out the exhaust duct. The blower wheel,
which is usually plastic, may wear out over time. But if it's noisy, it
may simply be clogged with lint. Clean the blower and test to see if
the dryer is still noisy. If it is, you probably need to replace the blower whell Many times the blower wheel is making the noise and it is commonly mistaken for the motor.

Motor

The motor may be making noise. The easy way to check is to remove the belt and turn the dryer on if it is noisy replace the motor

ALWAYS UNPLUG YOUR DRYER BEFORE STARTING ANY REPAIRS
Your dryer drum is mounted in the rear with a bearing, most likely the bearing is faulty and making the grinding noise, or maybe two conditions exist.
1...Bad drum bearing noisy
2...Bad drum bearing noisy, and with play in the bearing allowing the drum to rub the felt seal away at the door making metal to metal contact.Check your door for obvious rub signs...
I will include a parts house webpage link where you can look at you "exploded" view of your dryer and order parts also.
Please take time to rate mehttp://www.partselect.com/MultiModels.aspx?ModelNum=de7400p&searchTerm=&RefineSearch=0

Go to Sears and purchase a new belt & idler pulley wheel for yours. The bearing in the pulley has dried up bearing causing this noise. The belt will be stretched and replacing it the same time will save a future headache

Many dryers use rollers or wheels to support the clothes drum. When these rollers are worn, they can be noisy. You should replace the whole set of rollers at the same time.

Dryers have a tension or idler pulley that keeps tension on the main drive belt. When it's worn, it can be noisy. When that happens, don't lubricate it. Just replace it.

Many dryers use nylon or plastic glides at the front of the clothes drum for support. When these are worn, they can be noisy. When that happens, replace them.

Some dryers support the clothes drum in the rear with a center spindle instead of rollers. The spindle may be a ball-and-socket type support or a shaft through a sleeve. When the components are worn, they may squeak, squeal, or rub. You can't repair them. Just replace them when they're worn.

Your dryer's blower wheel pulls air over the heat source, through the clothes drum, and past the thermostats, then pushes it out the exhaust duct. The blower wheel, which is usually plastic, may wear out over time. But if it's noisy, it may simply be clogged with lint. Clean the blower and test to see if the dryer is still noisy. If it is, you probably need to replace it.

The drum rides on a pair of plastic glides in the front. They get thin and their bracket begins to rub the drum.The rollers tend to get a little noisy in time. I use HVAC oil (zoom-oil from ace hardware) to lube them because it is temp resistant, won't disapate, and is non flammable.

There are several things that can cause a dryer to be noisy. There
are a lot of moving parts in a dryer that can cause noises to occur
when they get worn. Several parts support the drum, and may make noise
or vibrations when worn out. Many times a dryer will squeak just a
little bit as it first starts. This should go away in just a few
seconds. Make sure nothing is loose inside the drum. Remove the lint
trap and look below the lint trap holder for any loose items that may
have slipped through the cracks.
The blower wheel is
always moving and lint is constantly going by it. If it’s noisy, it may
have gotten clogged with lint, or it may be worn and need to be
replaced. Clean out the area around the blower. If it’s still noisy,
replace it.
Many dryers use a center spindle to support the clothes drum. This
spindle may be a ball-and-socket support, or it may be a shaft inside a
sleeve. When these component bearings get worn out, they may make a
squealing or rubbing sound. Replace this bearing when it gets worn out.
Many dryers also use plastic glides in the front end of the clothes
drum. When these glides are worn out, you may hear a lot of noise. If
the glides are worn, replace them as a set.
Some dryers use rollers to support the clothes drum. If these
rollers or wheels are worn out, they can be extremely noisy. You ought
to replace the whole set at the same time. A belt that has been damaged
or frayed may make a thumping or slapping sound as the drum turns.
The gas valve solenoid will make a buzz type of sound as it opens.
The valve itself will give a little click as it starts the heat cycle,
when ignition begins, and when the burner is turning off. The burner
flame itself makes kind of a low-pitched roaring wind sound.

Idler pulley
Dryers have a tension or idler pulley that keeps tension on the main drive belt. When it's worn, it can be noisy. When that happens, don't lubricate it. Just replace it.

Glides
Many dryers use nylon or plastic glides at the front of the clothes drum for support. When these are worn, they can be noisy. When that happens, replace them.

Rear drum bearing
Some dryers support the clothes drum in the rear with a center spindle instead of rollers. The spindle may be a ball-and-socket type support or a shaft through a sleeve. When the components are worn, they may squeak, squeal, or rub. You can't repair them. Just replace them when they're worn.

Blower wheel
Your dryer's blower wheel pulls air over the heat source, through the clothes drum, and past the thermostats, then pushes it out the exhaust duct. The blower wheel, which is usually plastic, may wear out over time. But if it's noisy, it may simply be clogged with lint. Clean the blower and test to see if the dryer is still noisy. If it is, you probably need to replace it.

Sounds Like the drum is scraping. You can remove the drum and inspect the felt bearing/gasket for damage or a coin or screw that got lodged in it. You will need to remove Top and front in order to remove drum Carefully note the routing of the belt near the moter.